Long-distance distribution of genuine energy-time entanglement

A. Cuevas, G. Carvacho, G. Saavedra, J. Cariñe, W.A.T. Nogueira, M. Figueroa, A. Cabello, P. Mataloni, G. Lima and G.B. Xavier ()
Additional contact information
A. Cuevas: Universidad de Concepción, 160-C
G. Carvacho: Universidad de Concepción, 160-C
G. Saavedra: Center for Optics and Photonics, Universidad de Concepción
J. Cariñe: Center for Optics and Photonics, Universidad de Concepción
W.A.T. Nogueira: Universidad de Concepción, 160-C
M. Figueroa: Center for Optics and Photonics, Universidad de Concepción
A. Cabello: Universidad de Sevilla
P. Mataloni: Sapienza Università di Roma, Piazzale Aldo Moro 5
G. Lima: Universidad de Concepción, 160-C
G.B. Xavier: Center for Optics and Photonics, Universidad de Concepción

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Any practical realization of entanglement-based quantum communication must be intrinsically secure and able to span long distances avoiding the need of a straight line between the communicating parties. The violation of Bell’s inequality offers a method for the certification of quantum links without knowing the inner workings of the devices. Energy-time entanglement quantum communication satisfies all these requirements. However, currently there is a fundamental obstacle with the standard configuration adopted: an intrinsic geometrical loophole that can be exploited to break the security of the communication, in addition to other loopholes. Here we show the first experimental Bell violation with energy-time entanglement distributed over 1 km of optical fibres that is free of this geometrical loophole. This is achieved by adopting a new experimental design, and by using an actively stabilized fibre-based long interferometer. Our results represent an important step towards long-distance secure quantum communication in optical fibres.

Date: 2013
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DOI: 10.1038/ncomms3871

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